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<head>
    <meta charset="UTF-8">
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    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="/js任务/jquery-3.6.0.js"></script>
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    <div class="main"></div>
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<script>
    var age = 20;
    console.log(age);

    //用jq在网页添加h1标签
    var inBox = '<h1>'+ age+'</h1>';
    $(".main").append(inBox);
    

</script>
</html>